Laminated films and packaging

Abstract

The present invention provides a laminated film usable in the manufacture of PTP bottoming material, which can be manufactured by laminating a resin layer containing polychlorotrifluoroethylene and a resin layer containing a resin other than polychlorotrifluoroethylene by solvent-free lamination, and which has sufficiently high peel strength between these resin layers. [Solution] A laminated film 1 comprising an adhesive layer 13, a first resin layer 11 provided on one surface 13b thereof, and a second resin layer 12 provided on the other surface 13a thereof, wherein the adhesive layer 13 contains a urethane-based adhesive, the first resin layer 11 contains polyvinyl chloride, polyethylene, polypropylene, or polyester, and the second resin layer 12 contains polychlorotrifluoroethylene, and when a 180° peel test is performed at room temperature using a 15 mm wide test piece cut from the laminated film 1, the peel strength between the first resin layer 11 and the second resin layer 12 is 2 N / 15 mm or more.

Description

[Technical Field]

[0001] This invention relates to laminated films and packaging materials. [Background technology]

[0002] A press-through package (also referred to herein as "PTP") is a packaging body in which a bottom material with a recess and a sheet-like lid material are heat-sealed, and a storage compartment is formed by the recess and the lid material, and is widely used for packaging tablets.

[0003] Typically, laminated films, composed of multiple layers of resin, are used as the resin film for forming the base material of PTP (Press-Through Packaging). This is because it is difficult to achieve the various properties required for the base material with a single layer of resin film.

[0004] Laminated films are conventionally manufactured by applying an adhesive diluted with a solvent to one side of one resin film, removing the solvent from the formed coating layer and drying it to create an adhesive layer, and then laminating one side of the other resin film to the surface of this adhesive layer. This method of forming an adhesive layer by drying an adhesive diluted with a solvent and then bonding the resin films together using this adhesive layer is called dry lamination and is widely used.

[0005] Dry lamination is an excellent method for efficiently producing laminated films with high adhesive strength. However, since it typically uses volatile organic solvents, if there is no equipment to handle the volatile organic solvents, it can cause odors during the production of laminated films, which is harmful to human health. Furthermore, if organic solvents are released into the atmosphere, they have a negative impact on the environment. In addition, the need for a drying process reduces the efficiency of laminated film production.

[0006] In contrast, a method is known for bonding resin films together using a non-solvent adhesive in which the solvent content is below the detection limit or controlled to a small amount below a certain level, thereby substantially eliminating the use of organic solvents. This method is called solvent-free lamination (also known as non-solvent lamination, or simply non-sol lamination). When using solvent-free lamination, a coating unit equipped with multiple roll coaters heats a high-viscosity solvent-free adhesive to reduce its viscosity. This reduced viscosity adhesive is then applied to one side of one resin film to form an adhesive layer without a drying process. Finally, one side of the other resin film is bonded to the surface of this adhesive layer to produce a laminated film.

[0007] Solvent-free lamination has the advantage of not generating odors during the manufacturing of laminated films, being harmless to humans, and having no adverse impact on the environment, as it does not require a treatment system for volatile organic solvents, unlike dry lamination. Furthermore, it has the advantage of eliminating the need for a drying process, thus improving the manufacturing efficiency of laminated films (see Patent Documents 1-3). [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2010-280122 [Patent Document 2] Special Publication No. 2019-522063 [Patent Document 3] Japanese Patent Publication No. 2024-19263 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] By the way, examples of the laminated film for forming the base material of PTP include those in which a resin layer containing polychlorotrifluoroethylene and a resin layer containing a resin other than polychlorotrifluoroethylene are laminated via an adhesive layer. Such a laminated film can be stably manufactured by adopting dry lamination. However, when attempting to manufacture using solventless lamination, there is a problem that either the resin layers cannot be laminated together, or even if they can be laminated, only those with low peel strength and prone to peeling can be obtained.

[0010] The present invention provides a laminated film that can be used for manufacturing the base material of a press-through package, which can be manufactured by solventless lamination of a resin layer containing polychlorotrifluoroethylene and a resin layer containing a resin other than polychlorotrifluoroethylene, and has a sufficiently high peel strength between these resin layers, and a package body configured using the laminated film.

Means for Solving the Problems

[0011] In order to solve the above problems, the present invention adopts the following configuration. [1] A laminated film comprising an adhesive layer, a first resin layer provided on one side of the adhesive layer, and a second resin layer provided on the other side of the adhesive layer, wherein the adhesive layer contains a urethane-based adhesive, the first resin layer contains one or more selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester, and the second resin layer contains polychlorotrifluoroethylene, and when a peel test is performed in which a test piece with a width of 15 mm is cut from the laminated film, the first resin layer in the test piece is fixed at room temperature, and the second resin layer is pulled from one end toward the other end, so that the angle between the side of the first resin layer that was bonded to the second resin layer and the side of the second resin layer that was bonded to the first resin layer is 180°, and the second resin layer is peeled from the first resin layer for a distance of 100 mm at a peel speed of 50 mm / min, the peel strength between the first resin layer and the second resin layer is 2 N / 15 mm or more.

[0012] [2] A laminated film comprising an adhesive layer formed using an adhesive, a first resin layer provided on one side of the adhesive layer, and a second resin layer provided on the other side of the adhesive layer, wherein the first resin layer contains one or more selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene and polyester, and the second resin layer contains polychlorotrifluoroethylene and is made of polyethylene terephthalate, and a rectangular first film with a width of 25 mm, wherein a region from one end in the longitudinal direction to 50 mm is provided on one side of the first film A laminated film in which, when a test is performed within 300 seconds from the end of pressing, the tensile stress is 3N / 25mm or more, by bonding the first film made of polyethylene terephthalate to one side of the first film made of polyethylene terephthalate with the adhesive, by pressing with a roller, and making the thickness of the adhesive layer 3μm, the second film in the test laminate is fixed, and the first film in the test laminate is pulled at a tensile speed of 10mm / min in the longitudinal direction from one end to the other, the tensile stress is 3N / 25mm or more.

[0013] [3] The laminated film according to [1] or [2], wherein the solvent content in the adhesive layer is less than 5% by mass relative to the total mass of the adhesive layer. [4] The laminated film according to any one of [1] to [3], wherein the thickness of the first resin layer is 80 μm or more and the thickness of the second resin layer is 15 μm or more. [5] The amount of adhesive layer formed is 1.5 to 4 g / m² 2 The laminated film described in any one of items [1] to [4]. [6] A packaging body made using a laminated film as described in any one of the items [1] to [5]. [7] The packaging according to [6], wherein the packaging comprises a lid and a bottom, and the packaging is formed by a seal between the lid and the bottom, and the bottom is made of the laminated film. [Effects of the Invention]

[0014] According to the present invention, a laminated film is provided that can be used in the manufacture of a bottom material for a press-through package, and which can be manufactured by laminating a resin layer containing polychlorotrifluoroethylene and a resin layer containing a resin other than polychlorotrifluoroethylene by solvent-free lamination, and which has sufficiently high peel strength between these resin layers, and a packaging body constructed using the laminated film is provided. [Brief explanation of the drawing]

[0015] [Figure 1] This is a schematic cross-sectional view showing an example of a laminated film according to one embodiment of the present invention. [Figure 2] This is a schematic front view illustrating the method for fabricating a test laminate used for measuring tensile stress. [Figure 3] These are schematic front and side views illustrating a method for measuring tensile stress in a test laminate. [Figure 4] This is a schematic perspective view showing an example of packaging according to one embodiment of the present invention. [Figure 5]Figure 4 is a cross-sectional view of the packaging along the VV line. [Modes for carrying out the invention]

[0016] <<Laminated film (I) (Laminated film of the first embodiment)>> A laminated film according to one embodiment of the present invention comprises an adhesive layer, a first resin layer provided on one side of the adhesive layer, and a second resin layer provided on the other side of the adhesive layer, The adhesive layer contains a urethane-based adhesive. The first resin layer comprises one or more materials selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester. The second resin layer contains polychlorotrifluoroethylene (PCTFE), A test piece with a width of 15 mm is cut from the laminated film, the first resin layer in the test piece is fixed at room temperature, and the second resin layer is pulled from one end toward the other end, so that the angle between the surface of the first resin layer that was bonded to the second resin layer and the surface of the second resin layer that was bonded to the first resin layer is 180°, and the second resin layer is peeled from the first resin layer for a distance of 100 mm at a peeling speed of 50 mm / min (so-called 180° peeling), and the peel strength between the first resin layer and the second resin layer is 2 N / 15 mm or more. In this specification, the laminated film of this embodiment may be referred to as "laminated film (I)". The laminated film of this embodiment (laminated film (I)) has an adhesive layer containing a urethane-based adhesive, and even if it is manufactured by solvent-free lamination of a second resin layer containing polychlorotrifluoroethylene and a first resin layer containing one or more materials selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester, the peel strength between the first and second resin layers is 2N / 15mm or more, and based on good moldability, it enables the manufacture of press-through packaging (PTP).

[0017] The laminated film of this embodiment can be used in the manufacture of the bottom material for PTP. In this embodiment, it is preferable that the laminated film is transparent throughout.

[0018] Conventionally, solvent-free lamination has been applied to the manufacture of thin laminated films, and thicker laminated films, such as those used as bottomings for PTP, have not been manufactured using solvent-free lamination. This is because the bonded resin layers tend to peel apart when laminated using solvent-free lamination. In contrast, the laminated film of this embodiment, even with its thickness, can be manufactured using solvent-free lamination by forming an adhesive layer containing a urethane-based adhesive.

[0019] Figure 1 is a schematic cross-sectional view showing an example of a laminated film according to this embodiment. In addition, the diagrams used in the following explanation may be enlarged for convenience in order to make the features of the present invention easier to understand, and the dimensional ratios of each component may not be the same as in reality.

[0020] The laminated film 1 shown herein comprises an adhesive layer 13, a first resin layer 11 provided on one surface (sometimes referred to as the "second surface") 13b of the adhesive layer 13, and a second resin layer 12 provided on the other surface (sometimes referred to as the "first surface") 13a of the adhesive layer 13. That is, the laminated film 1 is constructed by laminating the first resin layer 11, the adhesive layer 13, and the second resin layer 12 in this order in the thickness direction.

[0021] The adhesive layer 13 contains a urethane-based adhesive. The first resin layer 11 includes one or more materials selected from the group consisting of polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and polyester. The second resin layer 12 contains polychlorotrifluoroethylene (PCTFE). The peel strength measured using a 15 mm wide test piece cut from laminated film 1 is 2 N / 15 mm or greater.

[0022] In the laminated film 1, the first resin layer 11 is the outermost layer on one side, and the second resin layer 12 is the outermost layer on the other side. In the laminated film of this embodiment, the outermost layer refers to the outermost layer in the stacking direction of each layer constituting the laminated film, and the outermost surface, as described later, refers to the outermost surface (i.e., exposed surface) in the stacking direction of each layer constituting the laminated film.

[0023] One surface of the first resin layer 11 (which may be referred to as the "second surface" in this specification) 11b is the same as one surface of the laminated film 1 (which may be referred to as the "second surface" in this specification) 1b, and is the outermost surface and the exposed surface. One surface of the second resin layer 12 (sometimes referred to as the "first surface" in this specification) 12a is the same as the other surface of the laminated film 1 (sometimes referred to as the "first surface" in this specification) 1a, and is the outermost surface and the exposed surface. Either the first surface 1a or the second surface 1b of the laminated film 1 is the sealing surface when heat-sealing with another film or molded body thereof, and the other is the exposed surface of the package obtained by heat-sealing.

[0024] For example, even if the laminated film 1 is manufactured by forming an adhesive layer 13 by coating the other surface (sometimes referred to as the "first surface" in this specification) 11a of the first resin layer 11 with a solvent-free urethane adhesive described later, and then laminating the other surface (sometimes referred to as the "second surface" in this specification) 12b of the second resin layer 12 to the first surface 13a of the adhesive layer 13, or by forming an adhesive layer 13 by coating the second surface 12b of the second resin layer 12 with a solvent-free urethane adhesive described later, and then laminating the first surface 11a of the first resin layer 11 to the second surface 13b of the adhesive layer 13, the peel strength between the first resin layer 11 and the second resin layer 12 in the laminated film 1 is sufficiently high.

[0025] Next, the characteristics of the laminated film (laminated film (I)) of this embodiment will be described in more detail.

[0026] <Peel strength between the first and second resin layers> The peel strength between the first resin layer and the second resin layer when the peel test (180° peel) is performed is 2N / 15mm or more, and may be, for example, 3N / 15mm or more, 6N / 15mm or more, or 9N / 15mm or more. The greater the peel strength, the greater the structural stability of the laminated film (I). The upper limit of the peel strength between the first resin layer and the second resin layer is not particularly limited. For example, a laminated film (I) having a peel strength of 15 N / 15 mm or less can be more easily realized. In one embodiment, the peel strength may be, for example, 2-15 N / 15 mm, 3-15 N / 15 mm, 6-15 N / 15 mm, and 9-15 N / 15 mm. However, these are just examples of the peel strength.

[0027] In the laminated film (I), the direction in which the second resin layer is pulled (for example, the longitudinal direction of the test piece) when measuring the peel strength between the first resin layer and the second resin layer may be the same as either the MD or TD of the laminated film (I), and it is preferable that it be the same as the MD. That is, the peel strength may be either the peel strength measured when the second resin layer is pulled in the same direction as the MD of the laminated film (I) in the test piece, or the peel strength measured when the second resin layer is pulled in the same direction as the TD of the laminated film (I), and it is preferable that the peel strength measured when the second resin layer is pulled in the same direction as the MD of the laminated film (I).

[0028] In this specification, "MD" means the machine direction (also referred to as the resin flow direction). "TD" means the transverse direction, which is perpendicular to the machine direction (MD).

[0029] The peel strength between the first resin layer and the second resin layer can be easily adjusted, for example, by adjusting the type and amount of urethane-based adhesive contained in the adhesive layer, as well as the thickness of the adhesive layer.

[0030] Next, we will describe in more detail each layer that makes up the laminated film (I).

[0031] <First resin layer> The first resin layer comprises one or more materials selected from the group consisting of polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), and polyester. The first resin layer is the main constituent layer of the laminated film (I) and can also function as a sealant layer.

[0032] Examples of polyethylene included in the first resin layer include low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), metallocene-catalyzed linear low-density polyethylene (mLLDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE).

[0033] In this specification, the densities of low-density polyethylene, linear low-density polyethylene, and metallocene-catalyzed linear low-density polyethylene are defined as 0.910 g / cm³. 3 More than 0.945g / cm 3 It is less than. The density of medium-density polyethylene (MDPE) is 0.945 g / cm³. 3 More than 0.955g / cm 3 It is less than. The density of high-density polyethylene (HDPE) is 0.955 g / cm³. 3 That's all.

[0034] Examples of polypropylenes included in the first resin layer include homopolypropylene (hPP), propylene-ethylene random copolymer (also known as polypropylene random copolymer, rPP), propylene-ethylene block copolymer (also known as polypropylene block copolymer, bPP), and ethylene-propylene terpolymer (also known as ethylene propylene terpolymer, EPT).

[0035] Examples of polyesters included in the first resin layer include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), and polytrimethylene terephthalate (PTT).

[0036] The first resin layer preferably contains one material selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester.

[0037] The first resin layer may or may not contain other components that do not fall under polyvinyl chloride, polyethylene, polypropylene, or polyester, as long as they do not impair the effects of the present invention. The other components contained in the first resin layer may consist of only one type or two or more types. If there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0038] The other components included in the first resin layer may be either resin components or non-resin components.

[0039] The resin component is not particularly limited as long as it is a resin that does not fall under any of the following categories: polyvinyl chloride, polyethylene, polypropylene, or polyester.

[0040] Among the other components contained in the first resin layer, the non-resin components include, for example, various additives known in the art, such as antifogging agents, antiblocking agents, antioxidants, antistatic agents, crystal nucleating agents, inorganic particles, viscosity reducers, viscosity thickeners, heat stabilizers, lubricants, infrared absorbers, and ultraviolet absorbers.

[0041] In the first resin layer, the ratio of the total content of polyvinyl chloride, polyethylene, polypropylene, and polyester to the total mass of the first resin layer (([Polyvinyl chloride content in the first resin layer (parts by mass)] + [Polyethylene content in the first resin layer (parts by mass)] + [Polypropylene content in the first resin layer (parts by mass)] + [Polyester content in the first resin layer (parts by mass)]) / [Total mass of the first resin layer (parts by mass)] × 100) is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, and 97% by mass or more. The laminated film (I) is more suitable for packaging and is particularly suitable for use as a bottom material for PTP. On the other hand, the aforementioned ratio is 100% by mass or less. Here, for example, if the first resin layer does not contain polyester, the polyester content of the first resin layer is 0 parts by mass. This is also true for polyvinyl chloride, polyethylene, and polypropylene. The aforementioned ratio is typically the same as the ratio of the total content of polyvinyl chloride, polyethylene, polypropylene, and polyester to the total content (parts by mass) of components that do not vaporize at room temperature in the resin composition described later (([Polyvinyl chloride content in the resin composition (parts by mass)] + [Polyethylene content in the resin composition (parts by mass)] + [Polypropylene content in the resin composition (parts by mass)] + [Polyester content in the resin composition (parts by mass)]) / [Total content of components that do not vaporize at room temperature in the resin composition (parts by mass)] × 100). The relationship between the content of a component in any of the layers constituting the laminated film and the content of that component in the composition for forming that layer is the same for layers other than the first resin layer, as will be described later.

[0042] In this specification, "room temperature" means a temperature that is neither cooled nor heated, i.e., a normal temperature, such as 15-30°C.

[0043] The first resin layer may be a single layer or multiple layers, but a single layer is preferred.

[0044] The thickness of the first resin layer is preferably 80 μm or more, and may be, for example, 120 μm or more, 160 μm or more, or 200 μm or more. When the thickness of the first resin layer is equal to or greater than the lower limit, the structure of the first resin layer becomes more stable, and the effects obtained by the laminated film (I) having the first resin layer are further enhanced. On the other hand, in order to avoid the first resin layer being excessively thick, the thickness of the first resin layer is preferably 300 μm or less. In one embodiment, the thickness of the first resin layer may be, for example, 80-300 μm, 120-300 μm, 160-300 μm, and 200-300 μm. However, these are just examples of the thickness of the first resin layer.

[0045] <Second resin layer> The second resin layer contains polychlorotrifluoroethylene (PCTFE). The second resin layer is the main constituent layer of the laminated film (I) and can also function as a sealant layer or a gas barrier layer (for example, an oxygen barrier layer or a water vapor barrier layer).

[0046] The second resin layer may or may not contain other components other than polychlorotrifluoroethylene, as long as it does not impair the effects of the present invention. The other components contained in the second resin layer may consist of only one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0047] The other components included in the second resin layer may be either resin components or non-resin components.

[0048] Of the other components contained in the second resin layer, the resin component is not particularly limited as long as it is a resin other than polychlorotrifluoroethylene.

[0049] Among the other components contained in the second resin layer, the non-resin component is the same as the non-resin component contained in the first resin layer.

[0050] In the second resin layer, the ratio of the polychlorotrifluoroethylene content to the total mass of the second resin layer ([Polychlorotrifluoroethylene content in the second resin layer (parts by mass)] / [Total mass of the second resin layer (parts by mass)] × 100) is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, or 97% by mass or more. When the ratio is equal to or greater than the lower limit, the laminated film (I) is more suitable for packaging and particularly suitable for use as a bottom material for PTP. On the other hand, the aforementioned ratio is 100% by mass or less.

[0051] The second resin layer may be a single layer or multiple layers, but a single layer is preferred.

[0052] The thickness of the second resin layer is preferably 15 μm or more, and may be, for example, 25 μm or more, 35 μm or more, or 40 μm or more. When the thickness of the second resin layer is equal to or greater than the lower limit, the structure of the second resin layer becomes more stable, and the effects obtained by the laminated film (I) having the second resin layer are further enhanced. On the other hand, in order to avoid the thickness of the second resin layer becoming excessive, the thickness of the second resin layer is preferably 150 μm or less, and may be, for example, 100 μm or less. In one embodiment, the thickness of the first resin layer may be, for example, 15-150 μm, 25-150 μm, 35-150 μm, and 40-150 μm, or 15-100 μm, 25-100 μm, 35-100 μm, and 40-100 μm. However, these are just examples of the thickness of the first resin layer.

[0053] <Adhesive layer> The adhesive layer includes a urethane-based adhesive. The adhesive layer may or may not contain other components besides urethane-based adhesives, as long as they do not impair the effects of the present invention. The other components contained in the adhesive layer may be one type or two or more types, and if there are two or more types, their combination and ratio can be arbitrarily selected according to the purpose.

[0054] The other components included in the adhesive layer may be either resin components or non-resin components.

[0055] Of the other components contained in the adhesive layer, the resin component is not particularly limited as long as it is a resin other than a urethane-based adhesive (in other words, a urethane-based adhesive resin).

[0056] Among the other components contained in the adhesive layer, the non-resin component may include, for example, a solvent and the same non-resin component contained in the first resin layer. Examples of the aforementioned solvent include organic solvents such as methanol.

[0057] Examples of the aforementioned urethane adhesive include a two-component urethane adhesive which is a mixture of a polyol having two or more hydroxyl groups in one molecule and a polyisocyanate having two or more isocyanate groups in one molecule. Examples of the polyol include polyester polyols and polyether polyols. Examples of the aforementioned polyisocyanates include aliphatic polyisocyanates and aromatic polyisocyanates.

[0058] Examples of the two-component urethane adhesive include an adhesive which is a mixture of the polyester polyol and the aliphatic polyisocyanate; an adhesive which is a mixture of the polyester polyol and the aromatic polyisocyanate; and an adhesive which is a mixture of the polyether polyol and the aliphatic polyisocyanate. Among these, the two-component urethane adhesive is preferably a mixture of the polyester polyol and the aliphatic polyisocyanate, as this provides a higher peel strength between the first resin layer and the second resin layer.

[0059] The number-average molecular weight (Mn) of the urethane adhesive may be, for example, 500 to 2000. Among the urethane-based adhesives, for example, the number-average molecular weight of the adhesive which is a mixture of the polyester polyol and the aliphatic polyisocyanate is preferably 1200 to 1600. If the number-average molecular weight of the urethane adhesive is below the upper limit, it is suitable for manufacturing a laminated film (I) by solvent-free lamination using a solvent-free urethane adhesive, as described later. If the number-average molecular weight of the urethane adhesive is above the lower limit, the adhesive strength of the urethane adhesive becomes greater.

[0060] In this specification, "number-average molecular weight" refers to the polystyrene equivalent value measured by gel permeation chromatography (GPC), unless otherwise specified.

[0061] In the adhesive layer, the ratio of the urethane-based adhesive content to the total mass of the adhesive layer is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, or 97% by mass or more. When the ratio is above the lower limit, the peel strength between the first resin layer and the second resin layer becomes greater. On the other hand, the aforementioned ratio is 100% by mass or less.

[0062] When the other component is the solvent, in the adhesive layer, the ratio of the content (parts by mass) of the solvent to the total mass (parts by mass) of the adhesive layer is preferably less than 5% by mass, and for example, it may be any one of 4% by mass or less, 3% by mass or less, 2% by mass or less, and 1% by mass or less. The laminated film (I) with such a low level of this ratio can be easily manufactured by solvent-free lamination of the first resin layer and the second resin layer. On the other hand, the ratio is 0% by mass or more, and 0% by mass, that is, the adhesive layer may not contain a solvent.

[0063] When the other component is a component other than the solvent, in the adhesive layer, the ratio of the content (parts by mass) of the other component other than the solvent to the total mass (parts by mass) of the adhesive layer is preferably 20% by mass or less, and for example, it may be any one of 15% by mass or less, 10% by mass or less, 5% by mass or less, and 3% by mass or less. On the other hand, the ratio is 0% by mass or more.

[0064] In the laminated film (I), the formation amount of the adhesive layer is preferably 1.5 to 4 g / m 2 and for example, it may be any one of 1.5 to 2.5 g / m 2 , and 2.5 to 4 g / m 2 When the formation amount of the adhesive layer is at least the lower limit value, the peel strength between the first resin layer and the second resin layer becomes larger. Further, when a molded body such as a base material described later is produced using the laminated film (I), even if the thickness of the adhesive layer becomes thin in the molded portion of the molded body, a large peel strength between the first resin layer and the second resin layer is maintained. When the formation amount of the adhesive layer is at most the upper limit value, in the laminated film (I), the so-called tunneling phenomenon in which a tunnel-shaped void portion occurs between the first resin layer and the second resin layer and the protrusion of the adhesive layer from the end face of the laminated film (I) are suppressed. These problems usually occur due to differences in the tension balance of these resin layers during solvent-free lamination of the first resin layer and the second resin layer.

[0065] <Other layers> The laminated film (I) may or may not include any other layer that does not fall under the first resin layer, the adhesive layer, or the second resin layer, as long as it does not impair the effects of the present invention. The types, placement positions, number, and thickness of the other layers mentioned above are not particularly limited and can be arbitrarily selected according to the purpose. However, it is preferable that the laminated film (I) does not have any of the other layers between the first resin layer and the adhesive layer, or between the adhesive layer and the second resin layer.

[0066] <Other configurations of the laminated film (I)> In the laminated film (I), it is preferable that the thickness of the first resin layer and the thickness of the second resin layer are both within the numerical range described above. For example, it is preferable that the thickness of the first resin layer is 80 μm or more and the thickness of the second resin layer is 15 μm or more.

[0067] The thickness (overall thickness) of the laminated film (I) is not particularly limited, but is preferably 150 to 350 μm, and may be, for example, 200 to 350 μm or 250 to 350 μm. When the thickness of the laminated film is greater than or equal to the lower limit, the strength of the laminated film is increased. When the thickness of the laminated film is less than or equal to the upper limit, the laminated film can be made thinner and molded more easily. Furthermore, when the thickness of the laminated film is within this range, the properties related to the molded body of the laminated film (I), such as the oxygen barrier properties, water vapor barrier properties, moldability, and the extrusion properties of the recesses of the base material which is the molded body of the laminated film (I), are improved in a well-balanced manner. Here, "extrusion properties of the recesses of the base material" means, for example, that even if unintended pressure is applied to the recesses during daily handling, the recesses will not collapse and the packaged goods will not be discharged, while on the other hand, when it is desired to remove the packaged goods, the packaged goods can be smoothly removed without pressing the recesses with excessive pressure.

[0068] <An example of laminated film (I)> A preferred example of a laminated film (I) is a laminated film comprising an adhesive layer, a first resin layer provided on one side of the adhesive layer, and a second resin layer provided on the other side of the adhesive layer, The adhesive layer contains a urethane-based adhesive. The first resin layer comprises one or more materials selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester. The second resin layer contains polychlorotrifluoroethylene, A test piece with a width of 15 mm is cut from the laminated film, and at room temperature, the first resin layer in the test piece is fixed, and the second resin layer is pulled from one end towards the other end, so that the angle between the surface of the first resin layer that was bonded to the second resin layer and the surface of the second resin layer that was bonded to the first resin layer is 180°, and the second resin layer is peeled from the first resin layer for a distance of 100 mm at a peeling speed of 50 mm / min. When this peel test is performed, the peel strength between the first resin layer and the second resin layer is 2 N / 15 mm or more. The urethane adhesive is a mixture of polyester polyol and aliphatic polyisocyanate, a mixture of polyester polyol and aromatic polyisocyanate, or a mixture of polyether polyol and aliphatic polyisocyanate. In the adhesive layer, the ratio of the solvent content to the total mass of the adhesive layer is less than 5% by mass. The amount of adhesive layer formed is 1.5 to 4 g / m². 2 One example is a laminated film (I). In such a laminated film (I), it is preferable that the thickness of the first resin layer is 80 μm or more, the thickness of the second resin layer is 15 μm or more, and the thickness of the laminated film (I) is 150 to 350 μm.

[0069] Another example of a preferred laminated film (I) is a laminated film comprising an adhesive layer, a first resin layer provided on one side of the adhesive layer, and a second resin layer provided on the other side of the adhesive layer, The adhesive layer contains a urethane-based adhesive. The first resin layer comprises one or more materials selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester. The second resin layer contains polychlorotrifluoroethylene, A test piece with a width of 15 mm is cut from the laminated film, and at room temperature, the first resin layer in the test piece is fixed, and the second resin layer is pulled from one end towards the other end, so that the angle between the surface of the first resin layer that was bonded to the second resin layer and the surface of the second resin layer that was bonded to the first resin layer is 180°, and the second resin layer is peeled from the first resin layer for a distance of 100 mm at a peeling speed of 50 mm / min. When this peel test is performed, the peel strength between the first resin layer and the second resin layer is 2 N / 15 mm or more. In the adhesive layer, the ratio of the solvent content to the total mass of the adhesive layer is less than 5% by mass. In the adhesive layer, the ratio of the urethane-based adhesive content to the total mass of the adhesive layer is 80% by mass or more. In the first resin layer, the ratio of the total content of polyvinyl chloride, polyethylene, polypropylene, and polyester to the total mass of the first resin layer is 80% by mass or more. A laminated film (I) is an example in which the second resin layer has a polychlorotrifluoroethylene content ratio of 80% by mass or more relative to the total mass of the second resin layer. In such a laminated film (I), it is preferable that the thickness of the first resin layer is 80 μm or more, the thickness of the second resin layer is 15 μm or more, and the thickness of the laminated film (I) is 150 to 350 μm. In such a laminated film (I), the amount of adhesive layer formed is 1.5 to 4 g / m². 2 It is preferable that this be the case.

[0070] The laminated film (I) is not limited to the embodiments described above, and some components may be modified, deleted, or added without departing from the spirit of the present invention.

[0071] <<Laminated film (II) (Laminated film of the second embodiment)>> A laminated film according to one embodiment of the present invention comprises an adhesive layer formed using an adhesive, a first resin layer provided on one side of the adhesive layer, and a second resin layer provided on the other side of the adhesive layer, The first resin layer comprises one or more materials selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester. The second resin layer contains polychlorotrifluoroethylene, A rectangular first film made of polyethylene terephthalate with a width of 25 mm is prepared by bonding a region of the first film from one end in the longitudinal direction up to 50 mm to one side of a second film made of polyethylene terephthalate using the adhesive, by applying pressure with a roller, and making the thickness of the adhesive layer 3 μm. The second film in the test laminate is then fixed, and the first film in the test laminate is pulled at a tensile speed of 10 mm / min in the longitudinal direction from one end to the other, and the tensile stress is measured. When this test is performed within 300 seconds from the end of the pressure application, the tensile stress is 3 N / 25 mm or more. In this specification, the laminated film of this embodiment may be referred to as "laminated film (II)". The laminated film (laminated film (II)) of this embodiment includes an adhesive layer formed using an adhesive that satisfies the aforementioned tensile stress conditions. Therefore, even if it is manufactured by solvent-free lamination of a second resin layer containing polychlorotrifluoroethylene and a first resin layer containing one or more materials selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester, it enables the manufacture of press-through packaging (PTP) based on good moldability. Furthermore, the peel strength between the first resin layer and the second resin layer in laminated film (II) may be 2N / 15mm or more.

[0072] Laminated film (II) is the same as laminated film (I), except that its adhesive layer may differ from the adhesive layer in laminated film (I). In other words, laminated film (II) can be either the same as laminated film (I) or different from laminated film (I).

[0073] <First resin layer, second resin layer> The first and second resin layers in laminated film (II) are the same as the first and second resin layers in laminated film (I), respectively. Therefore, a detailed explanation of the first and second resin layers in laminated film (II) will be omitted.

[0074] <Adhesive layer> The adhesive layer in the laminated film (II) is formed using an adhesive that satisfies the aforementioned tensile stress condition. The aforementioned tensile stress serves as an indicator of the peel strength between the first resin layer and the second resin layer in the laminated film (II).

[0075] The following describes the method for measuring the tensile stress of the adhesive and the method for preparing the test laminate used for measurement. Figure 2 is a schematic front view illustrating the method for preparing the test laminate, and Figure 3 is a schematic front view and a schematic side view illustrating the method for measuring the tensile stress.

[0076] When preparing the aforementioned test laminate, first, a rectangular polyethylene terephthalate (PET) film 6 is prepared, as shown in Figure 2(a), with a width W6 of 25 mm and a length L6. Then, as shown in Figure 2(b), the adhesive for forming the bonding layer is applied to the entire surface 6a of one side of the first film 6 to form a coating layer 230. If the adhesive is highly viscous and difficult to apply, the coating layer may be formed by diluting it with an organic solvent such as ethyl acetate, applying it, and drying it.

[0077] Next, as shown in Figure 2(c), on the exposed surface of the coating layer 230 (the surface opposite to the side of the first film 6), a distance L in the longitudinal direction is measured from one end of the coating layer 230 in the longitudinal direction. 60 To ensure that the entire area up to is exposed, one side of a rectangular third film 4 with a width of W4 and a length of L4 is bonded to the entire area of ​​the remaining exposed surface. 60 The length is set to 50 mm. As a result, the coating layer 230 provided on one surface 6a of the first film 6 in the region from one end 61 to 50 mm in the longitudinal direction is not covered by the third film 4 and is exposed. The third film 4 is used as a masking film thereafter.

[0078] Next, as shown in Figure 2(d), one side of the second film 5, which is rectangular in shape with a width of W5 and a length of L5 and made of polyethylene terephthalate, is bonded to the entire surface of the exposed surface of the coating layer 230, that is, the surface opposite to the first film 6, which is not covered by the third film 4 (an area of ​​25 mm × 50 mm).

[0079] Next, the laminated material (a laminate comprising the first film 6, the second film 5, the third film 4, and the coating layer 230) is pressed in the thickness direction using a roller to make the thickness of the coating layer (adhesive layer) 230 3 μm. This yields a test laminate 56.

[0080] In the steps up to this point, it is preferable to align the length direction of the third film 4 and the length direction of the second film 5 with the length direction of the first film 6, and to position the third film 4 and the second film 5 so that they do not overlap each other. The longitudinal directions of the first film 6, the third film 4, and the second film 5 may, for example, coincide with the MD or coincide with the TD. When the longitudinal direction coincides with the MD, the accuracy of evaluating the peel strength between the first resin layer and the second resin layer in the laminated film (II) becomes higher.

[0081] Here, we have described the case in which the third film 4 and the second film 5 are laminated to the coating layer 230 (first film 6) in this order, but the second film 5 and the third film 4 may also be laminated in this order.

[0082] The length L6 of the first film 6 is not particularly limited as long as the above-mentioned contact area with the second film 5 can be secured, but it is preferably, for example, 150 to 250 mm. The width W5 of the second film 5 and the width W4 of the third film 4 are not particularly limited as long as they can cover the exposed surface of the coating layer 230, but are preferably, for example, 30 to 50 mm. The length L5 of the second film 5 is not particularly limited as long as it can cover the exposed surface of the coating layer 230, but is preferably, for example, 100 to 200 mm. The length L4 of the third film 4 is not particularly limited as long as it can cover the exposed surface of the coating layer 230, but is preferably, for example, 50 to 150 mm.

[0083] The one surface 6a of the first film 6, which is the bonding surface, has a discharge rate of 20-60 W / m². 2 It is preferable to perform corona discharge treatment in the range of min before applying the adhesive. Similarly, the one surface of the second film 5 that will be bonded should have a discharge rate of 20 to 60 W / m 2 It is preferable to perform corona discharge treatment within the range of min before bonding to the coating layer 230. Doing so improves the accuracy of the tensile stress measurement.

[0084] When measuring the tensile stress, preferably in an environment with a temperature of 23°C and a relative humidity of 50%, the second film 5 in the test laminate 56 is fixed, and the laminated portion of the first film 6 and the third film 4 is held. As shown in Figures 3(a) and 3(b), the tensile stress is measured by pulling this laminated portion at a tensile speed of 10 mm / min in the direction from one end 61 of the first film 6 to the other end (the other end of the first film in its longitudinal direction) 62 (the direction of arrow D shown in Figures 3(a) and 3(b)). Figure 3(a) is a schematic front view illustrating the method for measuring the tensile stress, and Figure 3(b) is a schematic side view.

[0085] This test is performed within 300 seconds, preferably between 90 and 300 seconds, from the end of the pressurization by the roller described above (i.e., the preparation of the test laminate 56). The tensile stress measured at this time is adopted as the tensile stress (N / 25mm) of the test laminate 56 (laminated film (II)). In this embodiment, such tests may be performed using two or more (for example, 2 to 20) test laminates 56, and the average value of the obtained tensile stress measurements may be adopted as the tensile stress of the test laminate 56 (laminated film (II)). In that case, the tensile stress can be measured with higher precision.

[0086] Here, a method for measuring tensile stress using a third film (masking film) 5 to set the contact surface area between the exposed surface of the coating layer 230 and one surface of the second film 5 to 25 mm × 50 mm has been described. However, if the contact surface area can be adjusted to 25 mm × 50 mm, the tensile stress may be measured without using the third film 4. However, using a masking film such as the third film 4 allows for more accurate measurement of tensile stress.

[0087] Here, we have described the case in which the laminated portion of the first film 6 and the third film 4 in the test laminate 56 is pulled when measuring tensile stress. However, the manner in which the first film 6 in the test laminate 56 is pulled is not limited to this, as long as the first film 6 in the test laminate 56 can be pulled normally.

[0088] In this embodiment, the tensile stress is 3 N / 25 mm or more, preferably 3.5 N / 25 mm or more, and may be, for example, 4.3 N / 25 mm or more, 5.1 N / 25 mm or more, or 5.9 N / 25 mm or more. The greater the tensile stress, the better the suitability for bonding the first resin layer and the second resin layer by solvent-free lamination. On the other hand, the upper limit of the tensile stress is not particularly limited and may be, for example, 20 N / 25 mm or less. In one embodiment, the tensile stress may be, for example, 3 to 20 N / 25 mm, 3.5 to 20 N / 25 mm, 4.3 to 20 N / 25 mm, 5.1 to 20 N / 25 mm, and 5.9 to 20 N / 25 mm. However, these are just examples of the tensile stress.

[0089] The adhesive exhibiting the aforementioned tensile stress is not particularly limited as long as it has the above-described properties. In particular, the adhesive is preferably a solvent-free adhesive. In the solvent-free adhesive, the ratio of the solvent content (parts by mass) to the total mass (parts by mass) of the solvent-free adhesive is less than 5% by mass, and may be, for example, 4% by mass or less, 3% by mass or less, 2% by mass or less, or 1% by mass or less. The smaller the ratio, the less likely it is that problems caused by the use of solvents will occur. On the other hand, the aforementioned ratio is 0% by mass or more, and 0% by mass, i.e., a solvent-free adhesive, may not contain any solvent. Examples of the aforementioned solvent include those similar to those described earlier as potentially being included in the adhesive layer of the laminated film (I).

[0090] The adhesive exhibiting the aforementioned tensile stress may, for example, be a two-component urethane-based adhesive in the laminated film (I).

[0091] The number-average molecular weight (Mn) of the adhesive (adhesive resin) exhibiting tensile stress, contained in the adhesive layer of the laminated film (II), may be, for example, 500 to 2000. Among the urethane-based adhesives, for example, the number-average molecular weight of the adhesive which is a mixture of the polyester polyol and the aliphatic polyisocyanate is preferably 1200 to 1600. The number-average molecular weight of the adhesive is less than or equal to the upper limit, making it suitable for manufacturing a laminated film (II) by solvent-free lamination using a solvent-free adhesive. The number-average molecular weight of the adhesive is greater than or equal to the lower limit, resulting in greater adhesive strength.

[0092] The adhesive exhibiting tensile stress, contained in the adhesive layer of laminated film (II), may be the urethane-based adhesive contained in the adhesive layer of laminated film (I). Furthermore, the adhesive layer in laminated film (II) may be the same as the adhesive layer in laminated film (I).

[0093] In the adhesive layer of the laminated film (II), the ratio of the content of the adhesive exhibiting the tensile stress to the total mass of the adhesive layer is preferably 80% by mass or more, and may be, for example, 85% by mass or more, 90% by mass or more, 95% by mass or more, or 97% by mass or more. When the ratio is above the lower limit, the peel strength between the first resin layer and the second resin layer becomes greater. On the other hand, the aforementioned ratio is 100% by mass or less.

[0094] In the adhesive layer of the laminated film (II), the ratio of solvent content (parts by mass) to the total mass (parts by mass) of the adhesive layer is preferably less than 5% by mass, and may be, for example, 4% by mass or less, 3% by mass or less, 2% by mass or less, or 1% by mass or less. A laminated film (II) with such a low ratio can be easily manufactured by laminating a first resin layer and a second resin layer using solvent-free lamination. On the other hand, the aforementioned ratio is 0% by mass or more, and if it is 0% by mass, that is, the adhesive layer may not contain any solvent.

[0095] In the laminated film (II), the amount of adhesive layer formed is 1.5 to 4 g / m². 2Preferably, it is 1.5 to 2.5 g / m 2 , and 2.5~4g / m 2 It may be any of the above. By having the amount of adhesive layer formed within this range, the same effect as when the amount of adhesive layer formed in the laminated film (I) is limited can be obtained.

[0096] <Other layers> The laminated film (II) may or may not include other layers that do not fall under the first resin layer, the adhesive layer, or the second resin layer, as long as the effects of the present invention are not impaired. The types, positions, number, and thicknesses of the other layers may be the same as in the case of laminated film (I). However, it is preferable that the laminated film (II) does not have any of the other layers between the first resin layer and the adhesive layer, or between the adhesive layer and the second resin layer.

[0097] <Other configurations of laminated film (II)> In the laminated film (II), as with the laminated film (I), it is preferable that the thickness of the first resin layer and the thickness of the second resin layer are both within the numerical ranges described above. For example, it is preferable that the thickness of the first resin layer is 80 μm or more and the thickness of the second resin layer is 15 μm or more.

[0098] The thickness (overall thickness) of laminated film (II) may be the same as the thickness (overall thickness) of laminated film (I) for the same reasons as in the case of laminated film (I), and is preferably, for example, 150 to 350 μm.

[0099] <An example of laminated film (II)> A preferred laminated film (II) is a laminated film comprising an adhesive layer formed using an adhesive, a first resin layer provided on one side of the adhesive layer, and a second resin layer provided on the other side of the adhesive layer, The first resin layer comprises one or more materials selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester. The second resin layer contains polychlorotrifluoroethylene, A rectangular first film made of polyethylene terephthalate with a width of 25 mm is prepared by bonding a region of the first film from one end in the longitudinal direction up to 50 mm to one side of a second film made of polyethylene terephthalate using the adhesive, with the thickness of the adhesive layer being 3 μm, thereby creating a test laminate. The second film in the test laminate is then fixed, and the first film in the test laminate is pulled at a tensile speed of 10 mm / min in the longitudinal direction from one end to the other, and the tensile stress is measured. When this test is performed within 300 seconds from the end of the pressing, the tensile stress is 3 N / 25 mm or more. In the adhesive layer, the ratio of the solvent content to the total mass of the adhesive layer is less than 5% by mass. The amount of adhesive layer formed is 1.5 to 4 g / m². 2 One example is a laminated film (II). In such a laminated film (II), it is preferable that the thickness of the first resin layer is 80 μm or more, the thickness of the second resin layer is 15 μm or more, and the thickness of the laminated film (II) is 150 to 350 μm.

[0100] Another example of a preferred laminated film (II) is a laminated film comprising an adhesive layer formed using an adhesive, a first resin layer provided on one side of the adhesive layer, and a second resin layer provided on the other side of the adhesive layer, The first resin layer comprises one or more materials selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester. The second resin layer contains polychlorotrifluoroethylene, A rectangular first film made of polyethylene terephthalate with a width of 25 mm is prepared by bonding a region of the first film from one end in the longitudinal direction up to 50 mm to one side of a second film made of polyethylene terephthalate using the adhesive, with the thickness of the adhesive layer being 3 μm, thereby creating a test laminate. The second film in the test laminate is then fixed, and the first film in the test laminate is pulled at a tensile speed of 10 mm / min in the longitudinal direction from one end to the other, and the tensile stress is measured. When this test is performed within 300 seconds from the end of the pressing, the tensile stress is 3 N / 25 mm or more. In the adhesive layer, the ratio of the solvent content to the total mass of the adhesive layer is less than 5% by mass. In the adhesive layer, the ratio of the content of the adhesive exhibiting the tensile stress to the total mass of the adhesive layer is 80% by mass or more. In the first resin layer, the ratio of the total content of polyvinyl chloride, polyethylene, polypropylene, and polyester to the total mass of the first resin layer is 80% by mass or more. A laminated film (II) is an example in which the second resin layer has a polychlorotrifluoroethylene content ratio of 80% by mass or more relative to the total mass of the second resin layer. In such a laminated film (II), it is preferable that the thickness of the first resin layer is 80 μm or more, the thickness of the second resin layer is 15 μm or more, and the thickness of the laminated film (II) is 150 to 350 μm. In such laminated films (II), the amount of adhesive layer formed is 1.5 to 4 g / m². 2 It is preferable that this be the case.

[0101] The laminated film (II) is not limited to the embodiments described above, and some components may be modified, deleted, or added without departing from the spirit of the present invention.

[0102] <<Manufacturing method for laminated film>> The laminated film (laminated film (I), laminated film (II)) is obtained, for example, by forming a coating layer by applying an adhesive to one side of a long first resin layer or a second resin layer, using a urethane-based adhesive or an adhesive with a tensile stress of 3N / 25mm or more as the adhesive, and by laminating one side of a long second resin layer to the exposed surface of the coating layer (the side opposite to the first or second resin layer) if the coating layer is formed on the first resin layer, or by laminating one side of a long first resin layer if the coating layer is formed on the second resin layer, thereby producing a laminate film, and allowing the laminate film to age.

[0103] The laminated film can be manufactured by using a solvent-free urethane adhesive or a solvent-free adhesive with a tensile stress of 3N / 25mm or more as the adhesive, applying the heated adhesive, transferred by a roll coater, to one side of a long first resin layer or second resin layer, and then bonding the long second resin layer or one side of the first resin layer to the coated layer without heating and drying the formed coated layer; in other words, bonding the first resin layer and the second resin layer by solvent-free lamination. Even in this case, a laminated film with sufficiently high peel strength between the first and second resin layers can be obtained. The adhesive strength of the adhesive is usually lower immediately after bonding the first and second resin layers than after the obtained laminated film has been used for some time, but it is sufficiently high to suppress peeling between the first and second resin layers. Therefore, in a long laminated film after bonding the first and second resin layers, peeling between the first and second resin layers can be suppressed until it is wound into a roll. Furthermore, delamination between the first and second resin layers can be suppressed even in laminated films after a period of time (for example, after storage as a roll).

[0104] When performing the solvent-free lamination described above, the heating temperature during the application of the solvent-free urethane adhesive is preferably 40 to 80°C, and more preferably 60 to 80°C. When performing the solvent-free lamination described above, the amount of solvent-free urethane adhesive, or the amount of solvent-free adhesive applied to the first resin layer or the second resin layer, is 1.5 to 3 g / m². 2 Preferably, it is 1.5 to 2.5 g / m 2 It is preferable that it be so. When performing the solvent-free lamination described above, the transport speed of the first resin layer and the second resin layer is preferably 50 to 300 m / min, and more preferably 70 to 150 m / min. In the case of solvent-free lamination, since drying of the adhesive (drying process) is unnecessary, the transport speed can be increased compared to dry lamination, resulting in higher manufacturing efficiency of the laminated film.

[0105] When a two-component adhesive, such as the two-component urethane adhesive, is used as the adhesive, it is preferable to age the laminate film at 35 to 45°C for 24 to 168 hours. Maintaining a temperature or time above the lower limit stabilizes the adhesive strength (peel strength) between the first and second resin layers. Maintaining a temperature or time below the upper limit avoids excessive aging.

[0106] As described above, when manufacturing the laminated film, the adhesive may be applied to the first resin layer and then the second resin layer may be bonded to the exposed surface of the coated layer, or the adhesive may be applied to the second resin layer and then the first resin layer may be bonded to the exposed surface of the coated layer. However, in this embodiment, it is preferable to apply the adhesive to the resin layer of the first and second resin layers that has a rougher surface where the adhesive is applied. Doing so enhances the effect of suppressing the generation of voids between the first or second resin layer and the adhesive layer.

[0107] The first resin layer and the second resin layer can be manufactured by forming them into a film using a resin or resin composition that will be used as the forming material, by known methods such as melt extrusion. The resin composition may be manufactured by adjusting the types and amounts of its constituent components so that the layer to be formed contains the desired components in the desired amounts. For example, the ratio of the amounts of components that do not vaporize at room temperature in the resin composition is usually the same as the ratio of the amounts of those components in the layer formed from the resin composition.

[0108] Examples of resin compositions for forming the first resin layer include one or more selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester, and, if necessary, the aforementioned other components. Examples of resin compositions for forming the second resin layer include resin compositions comprising polychlorotrifluoroethylene and, if necessary, the other components.

[0109] If the laminated film (laminated film (I), laminated film (II)) includes the other layer, the desired laminate can be manufactured by laminating the other layer to one of the layers at an appropriate timing in the manufacturing method described above, depending on the type of the other layer, or by forming the other layer on the laminate film or laminated film obtained by the manufacturing method described above using a known method.

[0110] <<Packaging>> A packaging body according to one embodiment of the present invention is constructed using the laminated film according to the above embodiment of the present invention. The packaging of this embodiment has high stability because the peel strength between the first resin layer and the second resin layer in the laminated film is sufficiently high.

[0111] A preferred example of a packaging body according to this embodiment is a packaging body comprising a lid material and a bottom material, wherein the packaging body is constructed by sealing the lid material and the bottom material, and the bottom material is constructed using the laminated film.

[0112] Figure 4 is a schematic perspective view showing an example of the packaging according to this embodiment. Figure 5 is a cross-sectional view of the packaging shown in Figure 4 along the VV line. The packaging 101 shown here is a PTP (press-through package) and is composed of a lid material 8 and a bottom material 9. The planar shape of the packaging 101 is rectangular. The lid material 8 is preferably an aluminum sheet. The base material 9 is made using a laminated film according to the above-described embodiment of the present invention, and more specifically, it is a molded body of the laminated film.

[0113] The base material 9 has multiple recesses 91 that protrude from one side of the base material 9 (sometimes referred to as the "first side" in this specification) 9a and have openings on the other side of the base material 9 (sometimes referred to as the "second side" in this specification) 9b. In the packaging 101, the base material 9 is positioned with its second side 9b facing the lid material 8, and the first side 9a of the base material 9 is one of the outermost surfaces (exposed surfaces) of the packaging 101.

[0114] If the base material 9 is a molded body of the laminated film 1 shown in Figure 1, then either the first surface 1a (the first surface 12a of the second resin layer 12) or the second surface 1b (the second surface 11b of the first resin layer 11) of the laminated film 1 corresponds to the first surface 9a of the base material 9, and the other corresponds to the second surface 9b of the base material 9.

[0115] One side of the lid material 8 (sometimes referred to as the "first side" in this specification) 8a is the other outermost surface (exposed surface) of the packaging body 101, and in the packaging body 101, the lid material 8 is positioned with its other side (sometimes referred to as the "second side" in this specification) 8b facing the bottom material 9 side.

[0116] The packaging body 101 is constructed by sealing (heat sealing) the second surface 8b of the lid material 8 and the area of ​​the second surface 9b of the bottom material 9 where the recess 91 is not provided. The area of ​​the second surface 9b of the bottom material 9 where the recess 91 is provided is not sealed with the second surface 8b of the lid material 8, and in this area, the storage section 198 is formed by the second surface 9b of the bottom material 9 and the second surface 8b of the lid material 8. The contents 7 are sealed and stored in the storage compartment 198 of the packaging 101.

[0117] The opening of the recess 91 is circular or nearly circular (approximately circular). In this specification, "nearly circular" means a shape that is not circular but is approximately circular in nature, and cannot be clearly recognized as non-circular by visual inspection. The bottom surface of the recess 91 may be either flat or non-flat (e.g., curved). In the recess 91, when a cross-section is formed in a direction parallel to the surface of the flat portion (area without recess) of the base material 9, it is preferable that the opening of the recess 91 (cross-sectional opening) is similar in shape to the above-mentioned opening, that is, circular or nearly circular.

[0118] The inner diameter of the opening of the recess 91 is preferably 8 to 14 mm. The depth of the recess 91 is preferably 3 to 7 mm. If the bottom surface of the recess 91 is not flat, the depth at the deepest part of the recess is preferably within the above numerical range.

[0119] A slit 92 is formed on the first surface 9a side of the base material 9. More specifically, in the base material 9, multiple slits 92 are formed parallel to each other in the width direction of the packaging body 101. Each slit 92 is formed across the entire width of the packaging body 101. The presence of the slits 92 allows the packaging body 101 to be easily divided into specific numbers of storage compartments 198, thereby increasing the convenience of the packaging body 101.

[0120] The thickness of the flat portion of the base material 9 may be, for example, the same as the thickness of the laminated film described above. The thickness of the lid material 8 is preferably 15 to 90 μm, and more preferably 17 to 40 μm.

[0121] The contents of container 7 are preferably tablets. Examples of tablets include those that have physical properties similar to those of ordinary pharmaceuticals, such as hardness.

[0122] The packaging of this embodiment is not limited to the above-described form, and some components may be modified, deleted, or added without departing from the spirit of the present invention. For example, in the packaging 101, two rows of storage compartments 198 are provided in the width direction and four rows of storage compartments 198 are provided in the length direction. However, in the packaging of this embodiment, the number of storage compartments provided in the width direction and length direction is not limited to these. For example, in the packaging 101, the opening of the recess 91 in the base material 9 is circular or nearly circular (approximately circular), but in the packaging of this embodiment, the opening of the recess in the base material may have any other shape. Similarly, when a cross-section is formed in the recess in a direction parallel to the surface (first surface) of the flat portion (area without a recess) of the base material, the opening of the recess may be circular or nearly circular, or may have any other shape. The shape of the recess can be arbitrarily set according to the shape of the contents.

[0123] <<Manufacturing method for packaging>> The aforementioned packaging can be manufactured by heat-sealing the laminated film or a molded body thereof (e.g., a base material) and the object to be sealed (e.g., a lid material) while forming a storage compartment and storing the object to be packaged within the storage compartment.

[0124] Molded laminated films, such as base materials, can be manufactured by known methods. For example, the molding temperature is preferably 80 to 160°C, and the molding pressure is preferably 0.1 to 0.5 MPa.

[0125] When heat sealing a laminated film or its molded body with the object to be sealed, the sealing temperature is preferably 230 to 270°C, the sealing pressure is preferably 0.15 to 0.6 MPa, and the sealing time is preferably 4 seconds or less. [Examples]

[0126] The present invention will be described in more detail below with reference to specific examples. However, the present invention is not limited in any way to the examples shown below.

[0127] The raw materials for the two-component adhesives used in each example or comparative example are as follows. Main component (A1): Polyester polyol (DIC Graphics "HA-711B") Main component (A2): Polyether polyol (Rock Paint Co., Ltd. "083-0800 Adrock RN800") Main component (A3): Polyether polyol (Rock Paint Co., Ltd. "083-1200 Adrock RN200") Hardener (B1): Aliphatic polyisocyanate (DIC Graphics "DIC Dry 2K-SF-711a") Hardener (B2): Aliphatic polyisocyanate (Rock Paint Co., Ltd. "083-0850 Adrock HN-800") Hardener (B3): Aromatic polyisocyanate (Rock Paint Co., Ltd. "083-4100 Adrock HN-100")

[0128] [Example 1] <<Manufacturing of Laminated Films>> As the resin film for the first resin layer, a roll of polyvinyl chloride (PVC) film (thickness 250 μm, width 1200 mm) is prepared, and a discharge rate of 30 W / m is applied to the first surface of the film that will be bonded together. 2 Corona discharge treatment was performed as the minimum setting. As the resin film for the second resin layer, a roll-shaped polychlorotrifluoroethylene (PCTFE) film (thickness 50 μm, width 1200 mm) is prepared, and a discharge rate of 30 W / m is applied to the second surface of the film that will be bonded. 2 Corona discharge treatment was performed as the minimum setting. The main component (A1) and the hardener (B1) were each heated for several minutes in a temperature range of 60 to 80°C, and then immediately mixed in a mass ratio of main component (A1) / hardener (B1) = 2 / 1 to prepare a solvent-free urethane adhesive (S1).

[0129] The solvent-free urethane adhesive (S1), heated to 80°C in the coating section and transferred by a roll coater, was applied to the first surface of a corona-discharge treated PVC film fed out from the first feeding section to form a coating layer. The PVC film transport speed at this time was 100 m / min, and the coating amount of solvent-free urethane adhesive (S1) was 2 g / m². 2 That's what I decided. Next, a laminate film was prepared by laminating the second surface of the corona discharge-treated PCTFE film, which was unwound from the second unwinding unit, to the exposed surface (first surface) of the coating layer, and this was wound into a roll. At this time, the transport speed of the PCTFE film and the winding speed of the laminate film were the same as the transport speed of the PVC film. As described above, a first resin layer containing PVC (thickness 250 μm) and an adhesive layer containing solvent-free urethane adhesive (S1) (formation amount 2 g / m²) are formed. 2 A laminated film with the configuration shown in Figure 1 was obtained, in which a second resin layer (50 μm thick) containing PCTFE and a second resin layer containing PCTFE were laminated in this order in the thickness direction.

[0130] <<Evaluation of Laminated Films>> <Measurement of peel strength between the first and second resin layers> The laminated film obtained above was stored at 40°C for 4 days to stabilize the adhesive strength between the first resin layer and the second resin layer. From the long laminated film, a small rectangular piece with a width of 15 mm and a length of 10 cm, whose length coincided with the MD (Metal Modulus Diameter), was cut out and used as a test specimen. At one end of this test specimen along its length, the second resin layer was slightly peeled from the first resin layer to form a gripping portion. Immediately thereafter, this test specimen was subjected to humidity control treatment by being left to stand for at least 30 minutes in an environment of 23°C and 50% relative humidity.

[0131] Using a universal material testing machine (Orientec Co., Ltd. "RTC-1210A"), the second resin layer in the gripping part of the test piece after humidity control treatment was fixed to the upper gripping part, and the first resin layer was fixed to the lower gripping part. From this state, at room temperature, with the entire first resin layer fixed, the second resin layer was pulled from one end towards the other end (in the length direction of the test piece) via the upper gripping part, so that the angle between the surface of the first resin layer that was bonded to the second resin layer (first surface) and the surface of the second resin layer that was bonded to the first resin layer (second surface) was 180°, and a peel test (180° peel) was performed in which the second resin layer was peeled from the first resin layer for a distance of 100 mm at a peeling speed of 50 mm / min.

[0132] The above peel test was performed on a total of 10 test specimens, and the average of the integral mean load measured for each specimen was adopted as the peel strength (N / 15mm) between the first and second resin layers. The results are shown in Table 1.

[0133] <Measurement of tensile stress> A test laminate was fabricated using the method described above with reference to Figure 2. In other words, the discharge rate is set to 30 W / m² across the entire surface of the polyethylene terephthalate (PET) film that will be bonded together. 2 Corona discharge treatment was performed as the minimum setting. A solvent-free urethane adhesive (S1) was prepared in the same manner as during the production of the laminated film described above.

[0134] From a corona discharge-treated PET film, a strip-shaped piece with a width of 25 mm and a length of 150 mm, whose length coincided with the MD (Module-Dependent) direction, was cut out and designated as the first film. Furthermore, a rectangular piece with a width of 40 mm and a length of 300 mm, whose length coincided with the MD, was cut out and designated as the second film. A solvent-free urethane adhesive (S1) was applied to the entire surface of the corona discharge treated surface of the first film using a bar coater to form a coating layer.

[0135] A third film was prepared, which was rectangular in shape with a width of 40 mm and a length of 150 mm, and whose length direction coincided with the MD. One side of the third film was then attached to the entire area of ​​the exposed surface of the coating layer (the side opposite to the side of the first film), such that the entire area of ​​the coating layer from one end in the length direction of the coating layer to a distance of 50 mm in the length direction was exposed.

[0136] Next, the corona discharge treated surface of the second film was bonded to the entire area of ​​the exposed surface of the coating layer that was not covered by the third film (an area of ​​25 mm x 50 mm).

[0137] In the process up to this point, the length direction of the third film and the length direction of the second film were aligned with the length direction of the first film, and the third film and the second film were adjusted so that they did not overlap each other.

[0138] Next, these bonded materials were pressed using a roller to create a test laminate with the configuration shown in Figure 2(d), by making the thickness of the coating layer (adhesive layer) 3 μm.

[0139] The tensile stress was measured using the method described above with reference to Figure 3. Specifically, under conditions of 23°C and 50% relative humidity, a universal material testing machine (Orientec Co., Ltd. "RTC-1210A") was used to fix the second film in the test laminate, hold the laminated portion of the first and third films, and measure the tensile stress by pulling this laminated portion at a tensile speed of 10 mm / min in the longitudinal direction from the second film to the third film. This test was performed 90 seconds after the completion of the preparation of the test laminate.

[0140] The above tensile tests were performed on a total of 10 test laminates, and the average value of the tensile stress measured for each was adopted as the tensile stress (N / 25mm) of the test laminate (laminated film). The results are shown in Table 1.

[0141] <Evaluation of the appearance of laminated films> During the measurement of the peel strength between the first and second resin layers described above, the appearance of the laminated film was simultaneously observed visually. The appearance of the laminated film was then evaluated according to the following criteria. The results are shown in Table 1. [Evaluation Criteria] A: No clouding or streaks are observed throughout the laminated film, and the appearance of the laminated film is excellent. B: Whiteness or streaks are observed in at least a portion of the laminated film, resulting in a poor appearance of the laminated film.

[0142] <Evaluation of the effect of suppressing delamination between the first and second resin layers in a laminated film> The laminated film described above, immediately after manufacturing and just before being wound into a roll, was visually inspected to check for delamination between the first and second resin layers. The delamination suppression effect between the first and second resin layers was then evaluated according to the following criteria. The results are shown in Table 1. [Evaluation Criteria] A: No delamination was observed between the first and second resin layers throughout the entire laminated film, indicating a high delamination suppression effect. B: In at least a portion of the laminated film, delamination between the first resin layer and the second resin layer was observed, and the delamination suppression effect was either completely absent or very low.

[0143] <Evaluation of moldability of laminated films> Using a PTP packaging machine, the molding temperature was set to 130°C and the molding pressure to 0.4 MPa. A total of 40 recesses were formed in the laminated film obtained above, with 8 recesses per row and 5 rows in total, extending from the second resin layer side toward the first resin layer side along the length of the laminated film. The openings of the recesses in the bottom material were all circular with an inner diameter of 10 mm, and the depth of each recess was 4 mm. The obtained base material was visually inspected, and the moldability of the laminated film was evaluated according to the following criteria. The results are shown in Table 1. [Evaluation Criteria] A: No delamination was observed between the first and second resin layers throughout the entire base material, it was transparent, and the laminated film had high moldability. B: In at least a portion of the base material, delamination is observed between the first resin layer and the second resin layer, or the layer is opaque, resulting in poor moldability of the laminated film.

[0144] <<Manufacturing and Evaluation of Laminated Films>> [Example 2] The amount of solvent-free urethane adhesive (S1) applied and the amount of adhesive layer formed are 2 g / m². 2 Instead, 3g / m 2 Except for the points mentioned above, the laminated film was manufactured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0145] [Example 3] The differences lie in using roll-type homopolypropylene (hPP) film (250 μm thick, 1200 mm wide) instead of roll-type polyvinyl chloride (PVC) film (250 μm thick, 1200 mm wide), and in the amount of solvent-free urethane adhesive (S1) applied and the amount of adhesive layer formed, which were set to 2 g / m². 2 Instead, 3g / m 2 Except for the points mentioned above, the first resin layer containing hPP (thickness 250 μm) and the adhesive layer containing solvent-free urethane adhesive (S1) (forming amount 3 g / m²) are the same as in Example 1. 2A laminated film with the configuration shown in Figure 1 was obtained, in which a second resin layer (50 μm thick) containing PCTFE and a second resin layer containing PCTFE were laminated in this order in the thickness direction. This laminated film was then evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0146] [Example 4] The main component (A2) and the hardener (B2) were each heated for several minutes in a temperature range of 60-80°C, and then immediately mixed in a mass ratio of main component (A2) / hardener (B2) = 1 / 1 to prepare a solvent-free urethane adhesive (S2). Then, 2 g / m of the solvent-free urethane adhesive (S1) was applied. 2 Instead of applying the coating at the specified amount, use a solvent-free urethane adhesive (S2) at a rate of 3g / m². 2 Except for the coating amount, the first resin layer containing PVC (thickness 250 μm) and the adhesive layer containing solvent-free urethane adhesive (S2) (formation amount 3 g / m²) were the same as in Example 1. 2 A laminated film with the configuration shown in Figure 1 was obtained, in which a second resin layer (50 μm thick) containing PCTFE and a second resin layer containing PCTFE were laminated in this order in the thickness direction. This laminated film was then evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0147] [Comparative Example 1] The main component (A3) and the hardener (B3) were each heated for several minutes in a temperature range of 60-80°C, and then immediately mixed in a mass ratio of main component (A3) / hardener (B3) = 1 / 2 to prepare a solvent-free urethane adhesive (S3). Then, 2 g / m of the solvent-free urethane adhesive (S1) was applied. 2 Instead of applying the coating at the specified amount, use a solvent-free urethane adhesive (S3) at a rate of 3g / m². 2 Except for the coating amount, the first resin layer containing PVC (thickness 250 μm) and the adhesive layer containing solvent-free urethane adhesive (S3) (formation amount 3 g / m²) were the same as in Example 1. 2A laminated film with the configuration shown in Figure 1 was obtained, in which a second resin layer (50 μm thick) containing PCTFE and a second resin layer containing PCTFE were laminated in this order in the thickness direction. This laminated film was then evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0148] [Comparative Example 2] The amount of solvent-free urethane adhesive (S1) applied and the amount of adhesive layer formed are 2 g / m². 2 Instead, 5g / m 2 Except for the points mentioned above, the laminated film was manufactured and evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0149] [Comparative Example 3] The amount of solvent-free urethane adhesive (S1) applied and the amount of adhesive layer formed are 2 g / m². 2 Instead, 1g / m 2 Except for the points mentioned above, the laminated film was manufactured and evaluated in the same manner as in Example 1. The results are shown in Table 2.

[0150] [Table 1]

[0151] [Table 2]

[0152] As is clear from the results above, in Examples 1 to 4, laminated films were successfully manufactured by solvent-free lamination of a second resin layer containing PCTFE and a first resin layer containing PVC or hPP. In the laminated films of Examples 1 to 4, the peel strength between the first resin layer and the second resin layer was 2 N / 15 mm or more (2 to 11.2 N / 15 mm), which is sufficiently large, and peeling between the first resin layer and the second resin layer was suppressed in the laminated film immediately after manufacturing and just before being wound into a roll. In Examples 1 to 4, the adhesive layer contained a solvent-free urethane adhesive (S1) or (S2), and the tensile stress when using these adhesives was 4.1 N / 25 mm or more (4.1 to 6.8 N / 25 mm), which was sufficiently large.

[0153] Furthermore, in Examples 1 to 4, the laminated films exhibited high moldability, making them suitable for use in the manufacture of PTP base materials.

[0154] Furthermore, in Examples 1 to 4, the laminated films also exhibited excellent appearance, and these laminated films possessed particularly outstanding properties.

[0155] In contrast, in Comparative Examples 1 and 2, laminated films could not be successfully manufactured by solvent-free lamination of a second resin layer containing PCTFE and a first resin layer containing PVC. In Comparative Examples 1 and 2, delamination between the first and second resin layers was not suppressed in the laminated film immediately after manufacturing and just before being wound into a roll. As a result, the delamination strength between the first and second resin layers of the laminated film could not be measured, and the moldability could not be evaluated. The appearance of these laminated films was also poor. In Comparative Example 1, the adhesive layer contained a solvent-free urethane-based adhesive (S3), and the tensile stress when using this adhesive was 1.4 N / 25 mm, which was too low. In Comparative Example 2, although the adhesive layer contained a solvent-free urethane adhesive (S1), the amount of adhesive layer formed was 5 g / m². 2 And there was too much of it.

[0156] In Comparative Example 3, a laminated film was successfully manufactured by solvent-free lamination of a second resin layer containing PCTFE and a first resin layer containing PVC. However, the moldability of the laminated film was poor, making it unsuitable for use in the manufacture of PTP base material. In Comparative Example 3, although the adhesive layer contained a solvent-free urethane adhesive (S1), the amount of adhesive layer formed was 1 g / m². 2And that was far too little. In Comparative Example 3, the appearance of the laminated film was also poor. [Industrial applicability]

[0157] The present invention can be used in the manufacture of PTP, and in particular, enables the manufacture of PTP by laminating a resin layer containing PCTFE with a resin layer containing a resin other than PCTFE using solvent-free lamination. [Explanation of Symbols]

[0158] 1. Laminated film 11...1st resin layer 12...Second resin layer 13...Adhesive layer, 13a...Other side of the adhesive layer (first side), 13b...One side of the adhesive layer (second side) 230... Coating layer (adhesive layer) 6...First film, 61...One end of the first film in its longitudinal direction, 62...The other end of the first film in its longitudinal direction, 6a...One side of the first film 5. Film 2 56. Test laminate 8...Lid material 9...Bottom material 101...Packaging

Claims

1. A laminated film comprising an adhesive layer, a first resin layer provided on one side of the adhesive layer, and a second resin layer provided on the other side of the adhesive layer, The adhesive layer contains a urethane-based adhesive. The first resin layer comprises one or more materials selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester. The second resin layer contains polychlorotrifluoroethylene, A laminated film in which a test piece with a width of 15 mm is cut from the laminated film, the first resin layer in the test piece is fixed at room temperature, and the second resin layer is pulled from one end toward the other end, so that the angle between the surface of the first resin layer that was bonded to the second resin layer and the surface of the second resin layer that was bonded to the first resin layer is 180°, and the second resin layer is peeled from the first resin layer for a distance of 100 mm at a peeling speed of 50 mm / min, wherein the peel strength between the first resin layer and the second resin layer is 2 N / 15 mm or more.

2. A laminated film comprising an adhesive layer formed using an adhesive, a first resin layer provided on one side of the adhesive layer, and a second resin layer provided on the other side of the adhesive layer, The first resin layer comprises one or more materials selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, and polyester. The second resin layer contains polychlorotrifluoroethylene, A laminated film is prepared by creating a test laminate by bonding a region of a rectangular first film made of polyethylene terephthalate with a width of 25 mm to one side of a second film made of polyethylene terephthalate on one side of the first film, from one end in the longitudinal direction up to 50 mm, using the adhesive and applying pressure with a roller, and making the thickness of the adhesive layer 3 μm, fixing the second film in the test laminate, and measuring the tensile stress by pulling the first film in the test laminate at a tensile speed of 10 mm / min in the longitudinal direction from one end to the other, within 300 seconds from the end of the pressure, wherein the tensile stress is 3 N / 25 mm or more.

3. The laminated film according to claim 1 or 2, wherein the solvent content in the adhesive layer is less than 5% by mass relative to the total mass of the adhesive layer.

4. The laminated film according to claim 1 or 2, wherein the thickness of the first resin layer is 80 μm or more, and the thickness of the second resin layer is 15 μm or more.

5. The amount of adhesive layer formed is 1.5 to 4 g / m². ２ The laminated film according to claim 1 or 2.

6. A packaging body constructed using the laminated film described in claim 1 or 2.

7. The packaging comprises a lid and a bottom, The packaging is constructed by sealing the lid material and the bottom material, The packaging body according to claim 6, wherein the bottom material is constructed using the laminated film.

8. A packaging body constructed using the laminated film described in claim 4.

9. The packaging comprises a lid and a bottom, The packaging is constructed by sealing the lid material and the bottom material, The packaging body according to claim 8, wherein the bottom material is constructed using the laminated film.

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